After update to wordpress 5.0.3, I can’t publish any post at all. It keeps showing up Publishing failed error. Also, after save the draft. After that, I cant save it as draft/publish or anything. It only shows Draft failed, Publishing Failed. I only able to change it through quick edit. – https://www.screencast.com/t/9EGBPniw
Your website doesn’t seem to be hosted by WordPress.com, instead it is using the WordPress.org software on your own server (self-hosted). This forum is for providing support only for websites hosted on WordPress.com
There are two versions of WordPress – WordPress.com and WordPress.org. You can find more information about the differences between them here.
I would suggest that you look at the support page of WordPress.org and their forum – https://wordpress.org/support/. If you don’t have an account there you can create one for free here.